Mechanical Property of Pavement with Crack in Base and High Modulus Asphalt Layer

Abstract

When the crack appears in semi-rigid base layer, the stress mode of pavement structure transits from infinite continuum to limited size board, and the crack tips become stress concentration areas. This paper establishes the three-dimensional eight nodes entity reduced integral unit model by the practical tire contact pressure and contact area, to calculate and analyse the influence on the mechanical indexes in pavement structure with or without crack in base layer from high modulus asphalt layer under half-sinusoid load. Analysis shows that enhancing the modulus of surface layer could effectively reduce the tensile stress in bottom of base layer and avoid the bending broken in base bottom, but there exists risk that the bottom subbase and asphalt layer cracking.